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【单选题】
.一悬臂梁,焊接工字形截面,受向下垂直荷载作用,欲保证此梁的整体稳定,侧向支承应加在______A.
梁的上翼缘
B.
梁的下
C.
梁的中和轴部位
D.
梁的上及中和轴部位
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举一反三
【单选题】假设学生关系 S (SNO,SNAME,SEX),课程关系C(CNO,CNAME),学生选课关系SC(SNO,CNO,GRADE)。要查询选修“C语言”课程的女生的姓名,将涉及到如下哪个关系 ( )。
A.
S
B.
S,SC
C.
C,SC
D.
S,C,SC
【简答题】A．mostly B．main C．almost D．partly
【简答题】Robots are less popular in Britain today partly because ________.
【简答题】完形填空。 Peter is a waiter. He 1 in a restaurant. He is very busy, so he gets 2 very late every night. He does not stay at home 3 the day. Peter has a parrot (鹨鹉) at home. Its name is Dora. It is a beaut...
【单选题】Although he is very busy every day as manager of the company, he spends as much time as he can ___ with his family.
A.
stays
B.
stay
C.
to stay
D.
staying
【多选题】学生关系模式为 Student(Sno, Sname, Sgrade, Sdept, Sid, Smobilephone, Scardno) ,其中,S no 表示学号, Sname 表示姓名, Sex 表示性别, Sgrade 表示年级, Sdept 表示系名, Sid 表示身份证号, Smobilephone 表示手机号码, Scardno 表示图书证号。假设属性 Sgrade 、 Sdept...
A.
Sno
B.
Sname
C.
Sdept
D.
Sgrade
E.
Sid
F.
Smobilephone
G.
Scardno
【简答题】A．Mostly B．Totally C．Nearly D．Partly
【简答题】A．She knows he is very busy. B．He's already helped her enough. C．He is incompetent to help her. D．She doesn't need any help.
【单选题】假设学生关系是S(SNO,SNAME,SEX,AGE)，课程关系是C(CNO,CNAME,CREDIT)，学生选课关系是SC(SNO,CNO,GRADE)，要查找“选修数据库课程”的女学生的姓名，将涉及到的关系是（）。
A.
S
B.
C, SC
C.
S,SC
D.
S,C,SC
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